V2X Unicast Connection Establishment via Status-Based Target Selection
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Solution Overview
Problem
In LTE V2X technology, UEs typically communicate in a broadcast manner, making it difficult to establish unicast communication between terminals, which is necessary for advanced applications like vehicle formation and sensor information sharing.
Innovation Solution
A method for establishing a unicast connection between terminals by determining a target terminal based on status information such as position, travel track, and service characteristics, and configuring transmission parameters for unicast data communication, allowing direct communication between specific terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If broadcast communication is used for V2X communication, then communication coverage and simplicity are improved, but unicast communication capability and resource utilization are worsened
Solution Approach 1:
The patent segments the communication process into distinct phases: broadcast phase for service announcement and unicast phase for actual data transmission. The SA message is segmented to include both broadcast elements (service type, synchronization info) and unicast elements (target UE ID, dedicated resources), enabling the system to leverage benefits of both communication modes while avoiding their individual drawbacks.
2Measurement precision
If unicast connection establishment is implemented, then communication precision and resource efficiency are improved, but system complexity and establishment difficulty are worsened
Solution Approach 1:
The patent performs preliminary actions by pre-configuring unicast resources within the broadcast SA message. The transmitting UE includes dedicated uplink resources, target UE ID, and transmission parameters in the SA message before actual data transmission. This preliminary configuration simplifies the subsequent unicast connection establishment, as the receiving UE already has the necessary parameters to immediately transition to unicast mode without complex negotiation.
Solution Approach 2:
The SA message acts as an intermediary that bridges broadcast and unicast communication modes. It carries both broadcast information (service announcement) and unicast configuration (targeted communication parameters), serving as a mediator that enables the transition from broadcast to unicast without requiring separate complex establishment procedures.
3Ease of manufacture
If broadcast communication is used, then resource allocation simplicity is improved, but resource conflict and interference are worsened
Solution Approach 1:
The patent applies local quality by allocating different resource types to different communication needs. Broadcast resources are allocated for SA message transmission, while dedicated unicast resources are allocated for data transmission. This localized resource allocation ensures that broadcast and unicast transmissions do not interfere with each other, and multiple unicast pairs can communicate simultaneously without resource conflicts.
Data Source
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AI summary
A unicast connection establishment method for a direct link, a terminal and a device are provided, the method is applied to a first terminal and includes the following steps: determining, according to status information of at least one second terminal, one terminal of the at least one second terminal as a target terminal for a unicast communication of a direct link; and establishing a unicast connection of the direct link with the target terminal, and determining transmission configuration information for performing a unicast data communication with the target terminal.